Process of forming elastic anchors for incandescent-lamp filaments.



UNITED STATES PATENT OFFICE.

HARRY W. BRESLER, OF CHARLOTTENBURG, GERMANY, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PROCESS OF FORMING ELASTIC ANCHORS FOR INCANEESCENT-LAMP FILAMENTS.

No Drawing.

To all whom it, may concern:

Be it known .that I, HARRY W. BREsLnR, a citizen of the German Empire, residin at Charlottenburg, Kingdom of Prussia, Jerman Empire, have invented certain new and useful Improvements in Processes of Forming Elastic Anchors for Incandescent-Lamp Filaments, of which the following is a specification.

My invention relates to incandescent electric lamps and is particularly advanta eous in its application to lamps having metallic filaments. Such filaments are long and fine and mustbe supported at various points in their length, and in order to revent breakage of the delicate and 'fragi e structure of these filaments the supports or anchors at points intermediate of their length must be elastic. It is customary to make these sup ports or anchors out of very fine flattened wires which cannot well be fused into the glass support directly because they are liable to be burned off in the fusin process. To avoid this difficulty the plan of fusing a thicker wire into the glass support tried, and then forming a loop in this thick support into which one end of the fine flat-- tened wire anchor is melted. This operation is tedious and costly and consequently not altogether satisfactory and attempts have been made to revert to the practice of fusing the flattened spring anchor wire -directly into the glass support. As above stated, how- Speeification of Letters Patent. Application filed May 20, 1909. Serial No. 497,174.

has been Patented Mar. 8, .1910.

ever, this has resulted often in one or more of the wires being burned ofl by the heat of the flame used for melting the glass for fusing adjacent anchors in osition.

I have overcome these dltficulties by dispensing with the thicker wire support and the fine flattened wire and usin the fine spring wire of ordinary cylindrica cross section, Which, I find, can be fused directly into the glass support without danger of being burned off at any step in the process. After all the short bits of round wire are fused into the glass support I pressor otherwise give to the protruding portions of'the Wires, the necessary flat form, thus shaping them in sz'tu and obtaining the desired elasticity.

Having, therefore, tion, I claim:

The process of forming elastic anchors forfilaments of incandescent lamps which comprises the following steps: first, fusing pieces of round fine Wire into a glass support, and

described my invensecond, flattening said wires in situ to ,pro-.

duce the desired elasticity of the anchor.

In Witness whereof I have hereunto set my hand this sixth day of May, 1909, in the presence oftwo subscribing Witnesses.

- -Witnesses HENRY HASPER,

WOLDEMAR HAUPT. 

